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If they're electric fans, that's normal as the fans are cooling the radiator down. If you're still worried about it, the take your car to a radiator specialist or your mechanic.
this is an indication that there is a problem in the cooling system. Check the radiator cap is operating correctly. Check for correct operation of cooling fans ( replace if you have a viscous fan hub on the fan). Have a flow test done on the radiator as there may be too many cores blocked for efficient cooling. Run the fault codes to check for air/fuel /timing issues that will affect the engine operating temperature.
For many of the 90's and 2000's Toyota various models - Camry, Tacoma, 4 Runners, Corolla, and some other models overheating is usually caused by temperature sensitive fan switch on the radiator not operating. Electric fan on the radiator should operate when temp above 200 degrees. Less often the control relay 90987-03003 is defective. Check if bubbling in the radiator smells like exhaust. That would indicate a blown head gasket. A jumper wire from your marker light positive to the lower contact in the fan control relay socket will operate your fan when parking lights are on. The larger vehicles with more powerful radiator fans will need a hefty jumper from a headlight positive to avoid overheating the lighting wiring. Make sure the engine is off and warmed up to check the radiator core with your hand to see if it is getting circulation. If it is all cold the thermostat might be stuck.
Check that the fan is working properly, whether it is electric or a belt driven fan. A car will overheat if the fan doesn't function as originally designed.
both fans do not turn on at the same time. one fan is for the AC condensor and the other is for the radiator. A/C turns on one fan, Radiator temp switch turns on the other one. If you have never replaced the thermostat, or done a radiator flush/refill, you should do one now.
The radiator cooling fan is a variable speed electric motor driven fan. The radiator fan assembly includes an electric motor, fan blade, and a support shroud that is attached to the radiator. The radiator fan is serviced as an assembly (fan motor/fan/shroud).
The variable speed radiator fan is controlled by the Powertrain Control Module (PCM) by way of a Pulse Width Modulated (PWM) signal. The duty cycle ranges from 30% for low speed operation then ramps-up to 100% for high-speed operation. This fan control system provides infinitely variable fan speeds, allowing for improved fan noise, A/C performance, better engine cooling, and additional vehicle power.
To control radiator fan operation, the PCM looks at inputs from:
Engine coolant temperature A/C pressure transducer Ambient temperature Vehicle speed Transmission oil temperature (automatic transmission only
If you read the label on the radiator shroud/fan cowls, you will see that it says "Warning--These fans may operate at any time, even if the ignition is off."
This means that the computer monitors the coolant temperature through the sensor in the water neck, block, or radiator, and turns the fans on if any of them reports (true or not) that the coolant is too hot.
Obviously, there is nothing wrong with the fans, because they run.
First, check your coolant level; if it's too low, then the engine actually boils the coolant in the radiator, causing it to flash over to steam, which is hotter than the thermostat is set to allow the engine to operate. Check this in the radiator itself, not the coolant bottle, with the engine of course cold at the time of your check.
You have, at the least, a false signal from one of these sensors.
You could also have a faulty fan relay in the distribution box under the hood on the driver's side of the vehicle.
You could also have a faulty ECM (hope it's not that one...$$$).
Please let me know if this helps you, and remember to vote/comment.
the electric cooling fan for the radiator will not turn on when the engine reaches normal operating temp, its only supposed to come on if the engine temp goes over the normal temp. (around 220 degrees) it is normal for the fan to come on any time the a/c or defroster is turned on.
you did not state whether or not your electric fan is coming on all the time, check to see if your fan is operating properly , check all fan switches and temp sensors that are in the fan circiut... also check to see if your bottom hose is not collasping, and one more thing also since you have had the system open, some systems operate in reverse flow and need to be bleed of air pockets, look for a bleeder screw around the thermostat housing or pump housing... please rate my help , thanks
The rad fan is required to keep your engine at a normal operating temp. When you are going at hiway speeds the fan is not needed. When you stop then the fan has to operate to keep the engine cool.If the fan is not operating, it could be the fuse or fan relay or temp sensor or computer This problem should be checked by someone who is a professional..
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